Pilot pin for rolling mills



E. G. Bupn 1,764,929

PILOT BIN FOR 1105mm MILLS June 117 1930.

2 Sheets-Sheet l Filed Dec. 24. 1926 June 17, 1930. D 1,764,929

PILOT PIN FOR ROLLING MILLS Filed Dec. 24, 1926 2 Sheets-Sheet 2 INVENTOR. Edward 6.3%

A TTORNE Y.

i KM

Patented June 17, 1930 UNITED STATES VANIA PATENT OFFICE'ITV EDW'ARD e. BUDD, 0F PHILADELPHIA, PENNSYLVANIA, AssIGNoR To BUDDQWIHEEL COMPANY, or PHILADELPHIA, PE msYLvAnIA, A CORPORATION OFWPENNSYL- PILOT PIN FOR ROLLING IV IILLS Application filed December 24, 1826. Serial No. 156,839.

This invention consists of a blank-centering pin for rolling mills for use in the type of mill shown in the patent numbered 1,606,903, dated November 16, 1926, for process and apparatus for forging metallic discs, by John W. Smith.

The above mentioned patent comprises a rotating platen on which blanks are centered and clamped for a rolling operation by radially-traversing rolls. The present invention avoids the necessity for such clamping means by providing a pilot pin to perform the centering and retaining functions of the clamp.

An object of this invention therefore, is the provision of simple and efficient means for aligning a blank with a supporting platen, and for preventing its rotation relative thereto. Another object is the provision of an improved pilot pin, as hereinafter stated.

The invention is illustrated by the accompanying drawings, in which:

Figs. land 2.are respectively, side and end views of the improved pilot pin;

Figs, 3 and l are similar viewsof a modified form thereof, and

Fig. 5 is a view, to asmaller scale showing the pin of Figs. 1 and 2 in place in the platen of a rolling mill ofthe type specified. The improved pilot pin, which serves in place of the clamping means of the said patent comprises broadly a removable center for the platen and is designated generally, in the several figures, by the numeral, 2. In Fig, 5, the platen is indi cated at1. The pin being removable, can be made of harder and more durable material than the platen to provide for the extra wear which it must undergo.

More specifically, the pin 2, Figs. 1 and 2, comprises a threaded end 10, a body 12,

lugs or flutes 13 and a nib or point section. 16; y

The threaded end 10 and the cylindrical body 12, supplemented by a shoulder 11 therebetween, serve with the cooperating and mating portions of the pin seat in the platen, topositlon the p n in proper relation to the platen surface. A relieved portion 1 11 between the i said shoulder and the threads ensuresfull engagement of the pin in the platen.

with the pin properly positioned in its seat the surface 12 is flush with the surface of the platen. The cruciform lugs 'or flutes 13 provide keys,lying in the plane of the blank, when the latter. is in place on the platen. The said lugs extend radially outward at uniformly spaced intervals, (in the instances shown there are four lugs) from a relatively smaller prolongation 15 of the body 12. Complementary notches are provided about a central orifice in the blank adapted to fit the lugs 13 and the body extension 15.

The end faces 14 of the lugs 13 are beveled off, as shown, to facilitate the engagement of the orifice inlthe blank with the abovedescribed retaining portion of the pin.-

Above the surfaces lflthe body 15 extends for a shortspace, and then merges into a blunt, conical point or nib16.

From the above description, it is apparent that the operator of the machine equipped with the improved pilotpin need only engage the nib 16 of the pin withthe preformed central aperture of the blank, and then release theblank. The weight of the latter .will cause it to fall intoengagement with the lugs 13, where it is aligned with the axis of rotation ofthe platenand securely held against rotation relative thereto.

The modification shown in Figs. 3 and 4t differs from the above only in the radial extent of the lugs or plates13. This feature of Figs. 3 and 4 would be desirable where the forces to be resisted by the pin are ex cessive, as where large reductions "of the thickness of the blank were contemplated,

or difficult materialto'be worked. I

What I claim is substantially cylindrical body providing 10- eating means, a threaded extension of said body providing securing means, lugs project- 1.- A centering and retaining'pilotpin for M a rotating rolling mill platen,fcomprising a comprising a tapered outer end.

a blunt, tapered elongation of said body,

concentric therewith and with said lugs of different cross section.

2. A work centering and retaining pilot pin for rolling mills polygonal in cross section and'having certain of the polygonal surfaces relieved oppositely to the direction of rotation; x

V 3. As an article of manufacture, a centering and retaining pilot pin for rolling mills comprising retaining portion polygonally formed, the surfaces off-which are" relieved in a direction opposite to the direction of rotation, an entry portions'of less decided polygonalform and tapering longitudinally, and a screw threaded locating and securing shank of cylindrical form. p a

4, In combination, a rotatable rolling-mill platen, and a work centering and retaining device therefor comprising a pin having one end portion held in said platen, a second portion beyond the surface of said' platen and with rough peripheralcontour whereby work may be held thereon against rotation with respect thereto, and a thirdportion 5. A workcentering,and'retaining device for a rotatable rolling mill platen, said device comprlsing a pin polygonal atone portion and hav ng atone end a blunt tapered 7 point of a different c:oss-section than the polygonal portion, and at the end opposite .to said tapered. pointaportion adapted to be held in aplaten.

' vice comprising a pin having one end portion adapted to be held in a platen, second contour portion of rough peripheral v whereby work may be held against rotation Withrespect to said pin, and athird portion at the opposite end'fromfsaid first portion and including a tapered end. 7;

l '7. A work centeringv and reta ning device fora rotatable rolling mill platen, said device'comprising a pin having one portion l adapted to be held in'a platen, a second porv tiongof cruciform cross-sectional contour o whereby work 'may be firmly held against to said itapered outerend,

rotation relative 'to said pin, and a third portion comprising a tapered outer end.v '8. A work centerin and retalnln device e c b for a rotatable rollin rmill laten Sflldd- Vice comprisinga pin having one portion adapted to be held in a platen, a second ;portion nextfadjacent said firstportion and having laterally extending lugs whereby work may be held against rotation relative pin, and .a thirdportion v including a In testimony whereof he hereunto afiixes his signature. r I EDW VARD G B UDD;

V 6; A work centering and retaining device for a rotatable roll ng millplaten, said de- 

